#include <stdio.h>
#include <math.h>

#define PRINTF(X, ...) printf("Message " #X ": " __VA_ARGS__)

int main(int argc, char const *argv[])
{
    printf(__TIME__);
    double x = 48;
    double y;

    y = sqrt(x);
    PRINTF(1, "x = %g\n", x);
    PRINTF(2, "x = %.2f, y = %.4f", x, y);
    return 0;
}
